Answer on Other Physics Question for na

4 An electrical source with internal resistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?

R+rRR+rR

R−rRR−rR

RR+rRR+r

RrRr5 A battery of emf E and negligible internal resistance is connected to two resistancesR1R1andR2R2in series. What the potential difference acrossR2R2?

E(R1+R2)R2E(R1+R2)R2

E(R1+R2)R1E(R1+R2)R1

ER2R1+R2ER2R1+R2

ER1R1+R2ER1R1+R26 The electric current as a function of voltage of a wire is presented by the graph. What is the power dissipated in the resistor when the applied voltage is 5 V?Click here to see exhibit5 W10 W15 W20 W

Expert's answer

2016-08-22T04:40:19-0400

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